1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // UNSUPPORTED: no-threads
10 
11 // <memory>
12 
13 // shared_ptr
14 
15 // template <class T>
16 // bool
17 // atomic_compare_exchange_strong(shared_ptr<T>* p, shared_ptr<T>* v,
18 //                                shared_ptr<T> w);
19 
20 // UNSUPPORTED: c++03
21 
22 #include <memory>
23 
24 #include <atomic>
25 #include <cassert>
26 
27 #include "test_macros.h"
28 
main(int,char **)29 int main(int, char**)
30 {
31     {
32         std::shared_ptr<int> p(new int(4));
33         std::shared_ptr<int> v(new int(3));
34         std::shared_ptr<int> w(new int(2));
35         bool b = std::atomic_compare_exchange_strong(&p, &v, w);
36         assert(b == false);
37         assert(*p == 4);
38         assert(*v == 4);
39         assert(*w == 2);
40     }
41     {
42         std::shared_ptr<int> p(new int(4));
43         std::shared_ptr<int> v = p;
44         std::shared_ptr<int> w(new int(2));
45         bool b = std::atomic_compare_exchange_strong(&p, &v, w);
46         assert(b == true);
47         assert(*p == 2);
48         assert(*v == 4);
49         assert(*w == 2);
50     }
51 
52   return 0;
53 }
54